6b Extra info
Diverse plaatjes en info over metalen in de framebouw
Pictures and tables of metals used in frame building
Back in 1950 horizontal stays were 20mm
Columbus around 1990
Columbus tubes 1978
Tange Ultimate
Hetchins rearends were patented (not accidents)
Ishiwata tubing 80's
D-shaped forkcrown with A&P D-shaped forkblades.
Early aero-tubing around 1980
Cinelli Laser 1984
